Portion of an adapter



FIG. 1 is a right perspective view of a portion of an adapter showing our new design;

FIG. 2 is a front view thereof;

FIG. 3 is a rear view thereof;

FIG. 4 is a left side view thereof;

FIG. 5 is a right side view thereof; and,

FIG. 6 is a top view thereof.

The unshown bottom forms no part of the claimed design. The broken line showing of various regions in the Figures, including the unshaded areas therein, is for illustrative purposes only and forms no part of the claimed design. 

The ornamental design for a portion of an adapter, as shown and described. 